4.8/8.8/10.9/12.9 Zinc Steel Flat Head Socket Screws M3-M12 Countersunk Bolt SUS304 DIN7991

• Customization: Available
• Material: Iron/Steel
• Type: Countersunk Head
• Model NO.: M3 to M24 (#4- 1-1/2")
• Connection: Common Bolt
• Head Style: Counter Sunk Bolt
• Standard: DIN, ANSI, GB, BSW
• Grade: 4.8/8.8/10.9/12.9/A2-70/A4-80
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Galvanized/Black Oxide/Polished/HDG
• Color: Yellow/Blue/White/Black/Silver/Ash-Color
• Measurement: Metric/Inch
• Length: 10mm-100mm/Other Customized
• Pitch: Coarse /Fine
• Transport Package: Bluk/Bag/Box/Pallet
• Specification: M3 to M24 (#4- 1-1/2")
• Trademark: LingKe
• Origin: China
• Production Capacity: 3000000/Week
• Package Size: 20.00cm * 20.00cm * 20.00cm
• Package Gross Weight: 3.000kg

Product Description

Product Description

Flat Head Hexagonal Socket Bolt

Hexagon Socket Countersunk Head Bolts, also known as Allen bolts with countersunk heads, are precision-engineered fasteners designed for secure, flush-mounted connections in a wide range of applications. Their unique head geometry and internal hexagonal socket provide strength, aesthetic appeal, and ease of installation, making them indispensable in mechanical, automotive, aerospace, and construction industries.

These bolts feature a conical head that tapers to a flat underside, allowing them to fully sink into countersunk holes for a smooth, flush surface. The head angle (typically 90° or 120°) matches standard countersink angles, ensuring seamless integration into mating components. A recessed hexagonal socket in the center enables torque application using hex keys (Allen wrenches), offering precise control and resistance to tool slippage. The threaded shaft extends from the head, available in full or partially threaded designs, with chamfered ends for

 Flush Design: Countersunk head eliminates protrusions, preventing interference and enhancing safety/aesthetics.
 Torque Efficiency: Hex socket allows for consistent tightening without cam-out, ideal for high-torque applications.
 Versatility: Compatible with metal, wood, plastic, and composite materials using appropriate thread types.
 Reusability: High-grade materials and thread designs allow for multiple disassembly cycles without degradation.

Specification

Product Name	Machine Screws
Bolt Type	Countersunk Head Hex Socket Bolts
Material	Carbon Steel/Stainless Steel  304 316 /Alloy Steel/Aluminum/Other
Standard	DIN7991, GB/T 70.3, ISO 10642
Grade	4.8/8.8/10.9/12.9/A2/A4/Other
Surface Treatment	Galvanized(Zinc/Nickel/Titanium/Copper)/Black Oxide/HDG/Dacromet/Polished
Color	Yellow/Blue/White/Black/Silver/Ash-Color
Measurement	Metric/Inch
Thread Diameter	M3 to M24 (metric) or #4 to 1-1/2" (imperial)/Other Customized
Length	10mm-300mm/Other Customized
Service	Support OEM/OBM/ODM Customized Service

Packing & Delivery

Bulk/Fiber Bag/Neutral packing

Carton/Box

Wood Pallet/Box

Bagged packaging is ideal for smaller quantities of fasteners. The fasteners are placed in durable plastic bags, which are then sealed to protect the contents from moisture and dust. Each bag is clearly labeled with product details and quantities. This packaging is easy to handle and transport for smaller orders, making it convenient for workshops and retail settings.

Boxed packaging offers a more structured solution for medium to large quantities of fasteners. The fasteners are packed in sturdy cardboard boxes, which provide additional protection against physical damage during transit. The boxes are designed to stack neatly, optimizing storage space. Each box is labeled with essential information, ensuring easy identification and inventory 

Palletized packaging is used for bulk shipments of fasteners. Multiple boxes or bags are securely strapped onto a pallet, creating a stable and easily transportable unit. This method is highly efficient for large-scale distribution and warehousing. Palletized packaging ensures that large quantities of fasteners can be moved quickly and safely using forklifts, reducing handling time and labor costs.

Company Profile

Certifications

FAQ

Q: What is the estimated lead time for orders?
A: Our estimated lead time is 15-30 days for 1-2 containers and extends to 30-45 days for 3-20 containers, ensuring timely delivery.
Q: Are you a professional manufacturer?
A: Absolutely! We have proudly been at the forefront of manufacturing since 1995.
Q: Is it possible to request a customized size?
A: Indeed! We offer customization services to tailor products precisely to your design specifications.
Q: What export documentation do you provide?
A: Our comprehensive export package includes a Commercial Invoice, Packing List, Bill of Lading, and COC, among other essential documents.
Q: How can I place an order?
A: Simply contact us via email or phone to receive a quote and finalize your order with a Purchase Order (PO).